The frictional part for the frictional action device, and the frictional action device which possesses the frictional part of the aforementioned type

摘要

This invention has the inside edge (20) and the outer part edge (22) the annular friction surface which it possesses (18), the friction surface (18) the groove of 1 sets (24) is provided at least, the groove of this group (24) is present, the inside edge (20) or the outer part edge (22) from the inside edge (20) with the outer part edge (22) with turning point between (34) to extending the 1st groove which is present (32) with, turning point (34) from the other edge (22 and 20) to extending respectivelyThe 2nd and 3rd groove (40 and 42) with it possesses, the frictional part for the frictional action device it regards (2). As the 2nd groove (40) the friction surface (18) marginal direction of one side (28) inclines according to this invention, turning point (34) the radius line which it passes (38) vis-a-vis, the 3rd groove (42) is inclined other marginal direction (30). In addition as for this invention, the frictional part of the aforementioned type the frictional action device which it possesses (2) is stated.